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Cambridge Chemistry Challenge

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Hi! How about you tell us where you're at so far? Can't really help much when it's so vague... :s-smilie:

Mind if i could have a hint on silver?

I havent used the volume formula before the one with n R T an P in it (sorry cant remember it now aha), but i tried using it at STP by putting the volume given from L to m3 (/1000) then subbed it in, I didnt know what he pressure was meant to be... Unless im finding moles first with 1mol of N2 in 24dm3. /1000 =moles in one m3. x the volume they gave me? Then sub in and convert back to L for the answer...

Clueless really aha.

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Reply 1861

Swag hatter

Original post by fizzers

Hi! How about you tell us where you're at so far? Can't really help much when it's so vague... :s-smilie:

I'm in a similar place to the person below, started it but no really sure which way to head. :eek

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Reply 1862

king_revision

Original post by majmuh24

Carbon and Sulfur... C + S

Its about what's uses to make fireworks, hope this helps :smile:

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Haha, yeah it did. I worked it out later on :biggrin:

I got to silver and now i've given up because each questions takes ages to figure out now...

Reply 1863

fizzers

Original post by Nat_LPS

Sorry for the late reply! I'm just gonna list the steps out to make it easier to understand kk

•

Calculate the mass of N2

•

Convert mass to moles

•

Estimate volume in standard temp and pressure (-273.15 K and 10⁵ Pa -this is defined by IUPAC)

•

Since in the STP condition, N2 gas behaves according to the ideal gas law which is pV=nRT, V=n x R x T

•

Now simply sub the numbers in!

Just be careful with the ideal gas constant R- it should be in L bar/K Mol. You can probably look it up though :cool:

Have fun aha!

Reply 1864

fizzers

Original post by Swag hatter

I'm in a similar place to the person below, started it but no really sure which way to head. :eek

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Read my reply to the other user! No point for me posting it twice and spamming everyone heh :tongue:

Reply 1865

Nat_LPS

Original post by fizzers

Sorry for the late reply! I'm just gonna list the steps out to make it easier to understand kk

•

Calculate the mass of N2

•

Convert mass to moles

•

Estimate volume in standard temp and pressure (-273.15 K and 10⁵ Pa -this is defined by IUPAC)

•

Since in the STP condition, N2 gas behaves according to the ideal gas law which is pV=nRT, V=n x R x T

•

Now simply sub the numbers in!

Just be careful with the ideal gas constant R- it should be in L bar/K Mol. You can probably look it up though :cool:

Have fun aha!

Ahh thanks a lot! i'll tackle it after a few cups of coffee, half that stuff i dont know what it is haha so im very grateful :tongue:

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Reply 1866

fizzers

Original post by Nat_LPS

Ahh thanks a lot! i'll tackle it after a few cups of coffee, half that stuff i dont know what it is haha so im very grateful :tongue:

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No problem! If you're stuck just pop in another reply to the thread :biggrin:

Reply 1867

Nat_LPS

did anyone else almost self implode before completing silver or is there no hope?

Reply 1868

fizzers

Original post by Nat_LPS

did anyone else almost self implode before completing silver or is there no hope?

No don't give up! You have another 10 days to do it if you want to. Do you need help with anything? Hahaha we've all been there, done that. It sure as heck could be stressful! :s-smilie:

Reply 1869

User1206819

I am stuck on the Rg question!!!!!!!!!!! Can anyone point me in the right direction. I have been awake for 13 hours staring at my screen trying to work it out #holidays.

Reply 1870

yangg

Original post by Kkg1

I am stuck on the Rg question!!!!!!!!!!! Can anyone point me in the right direction. I have been awake for 13 hours staring at my screen trying to work it out #holidays.

I did this a while ago so I hope I remembered the right question! So basically you have three columns, right? The values for the first two columns can be found on the periodic table and the third column gives you the nuclear spin number. Once you know that the values should be easy to look up.